function showCurrentPosition(lat,lon){
	var LatLng = new google.maps.LatLng(lat, lon);
	currentPositionPoint = new google.maps.Marker({
		position : LatLng,
		//title : "当前位置"
		icon:"./images/gray_blank.png"
	});
	currentPositionPoint.setMap(map);
	map.setZoom(15);
	map.panTo(LatLng);
	infowindow.open(map, currentPositionPoint);
	//mapController.setZoom(18);
}
var infowindow = new google.maps.InfoWindow({
	content : "我在这里",
});

function hideCurrentPosition(){
	currentPositionPoint.setMap(null); 
}